Why the patients with Hirayama disease have abnormal cervical sagittal alignment? A radiological measurement analysis of posterior cervical extensors

Table 1 Parameters included in this study

Abbreviations	Definition
CSA	Cross-sectional area
VBA	Vertebral body area
R-CSA	Relative cross-sectional area
CE*	Cervical extensors
SVA	Sagittal vertical axis
LKA	Local kyphosis angle
CL	Cervical lordosis

ISSN: 1749-799X